Machine for making lengths of paper or cellulose



Dec. 18, 1956 K. FEER 2,774,284

MACHINE FOR MAKING LENGTI-IS OF PAPER OR CELLULOSE Filed March 31, 1955 I 61 37 4'4 1 46 so ,I 4s 6'0 35 '30 34' 33 INVEN'TOR KURT FEE/ ATTORNEY United States Patent '"ice R MeKJNG LENGTHS: LQ

PAPER 012-; CELLULOSE 11 7; ear, W ute tb r, w t?enlan ,v assignor tog-Suite! t a in A q yme wint r ime-S zer and. a corpcration of Switzerland,

Application March 21, 1955 Serial-No. 495,612 7 la P bri yi app isafian-fiwit er aadzMa sh 1Q1254- v5; Claims. (Cl; 92-44) The present invention relates to a machine. formaking lengthsof, paper or cellulose includingv aturbocompressor devices. for. drawingv liquid. from the paper mat formed. at the wet end of the machine on a{ Wire and a felt ribb onwhereby the paper-mat is transferred frorn the wire to the felt ribbon by means ofv a transfer roll, the paper mat, being normally drawnonto the roll by f suction efiect.

It. is the object of the inventionto provide amechanism for selectively controlling the suction pressure on the transfer, roll either manually or automatically in response to the vacuum in at least one suction box which is passed by the paper mat after it hasleft the transfer roll. The system according to the inventionv alfords automatic control of the vacuum at the-tran sfer roll during normal operation in the same manner asat any other vacuum box, particularly. so that if the-cellulose or paper is broken and air enters'a box passed by the paper after the transfer'roll the suction conduit to the suction box in the transfer; roll is throttled and. the latter can be lifted away'from its normal position at thewire into an inactive position without taking the mat of paper along. The latter continues to-moveon the wire and is not transferredto the felt ribbon so that it can drop into aicontainer. If the transfer roll is lowered totits normal operating position, after the severedrests of the paper mat have been removed, sutficient suction pressure can be applied by a manual adjustment to .drawvthe mat of paper to the transfer roll. away from; the wire for transfer to the feltribbombeforethe subsequent vacuum hoxes' -are covered by the paper, i. e. before full vacuum is restored in the subsequent boxes.

If desired, the-throttleleffect in the suctionconduitpf the transfer roll caused by a tearing-of thepaper may be so controlled that the mat of paper. follows'thewire and; is dropped into acontainerinstead of: being trans: ferred to the felt ribbon, although'the transferfroll remains in its operating position; i. e. is not lifted. Inithis case the transfer roll must not-be moved away from the wire in order to prevent flow of Vthe'paper onto the felt ribbon; throttling of-the suction conduit leading; to the suction box in the transfer rollrproducesfthe desired result and the rotation axis of the transfer roll can be stationary.

Paper making machines including attransfer roll of the type described supra have been built;}these mach ne s, however, used a pluralitytof individual water nn g umps. i. e. volumetric pumps, for producing vacuum 1na pluralityof suction boxes, instead of a turbocompressor for all suction boxes. There is no danger of overloading volumetric pumps ascompared with turbocompressors so that no automatic vacuum control devices and no mechanism for selectively controlling the suction pressure automatically or by hand were providedin the conventional machines includinga transferroll. p I

In a preferred embodiment of the inventiona hydrau lj ally rating antomaticsuction controlrnechamsm is id d f the vacuum hoxesof the felt r bbon portion 2,774,284 Patented Dec. 18, 1956 afith m chiaaiwhere yfihe nictionprcssurq at he fer roll is controlleddn; responseito;the suction,pressure in-at least one-of; the vacuum :boxes of the felt ribbon P i n f t e: ma h ne: A flu pr operated actuator controls a valve in; the suction. conduit. of the suctionbox within the transfer roll which 'actuatorcan be: selectively connected-with. a jcpntrol: conduitfor similar a tufiturs for valyes-in-the suction conduits ofivacuum qaeswhi hi enasse bythe pape a t r-the transfenroll, Or w t e ressarefiuid upply o du orlwith pra u fluid reliefcpndtiit, The; manual peration of the mechanism camproduce; two effect The actuatOI-i for; the throttle valve in the. su ;cj1i n c9 duit of thesiuction box the-transfer roll cfilbbmmar pally COHIIQCtfidTWithi-a flui Pre su e supply qandu t QuWith a fluid pressure relief ionduit; ire;- th'rottle vvalye "can he movedt-by ha din w av rn o hrot in pos o -t .I P pe after passing all yacuu nboxes of the machine, or samp he dry' en f: h machine he control es is ca maaaally setasljus ed tha t e is ubstan a ly nQ.= ?ti9 f-Eet at: hefl r nsferjroll an the flow ofthe :paper rpm the wire to the. feltri'obon isinterrnptegh; The nnah operation does not require increase of pressure at a vacuum boxfor-- closing? the hmt e; a u -mik l..i 9l ::in i ;0f e. u n box the transfer; roll.

v ii an e nb dimentgof theinyention, a-three-wayV-valve is interposed in the;contgol conduit for the actuator'of the-throttle talveing the;suc ti on; conduit of the suction bo n the flanne 161. elec i y co t the aotpatoi with thecontrol cendpits of the actuatorsfor the tht-QtflfiV Ye ,jn -the;suction conduits of: the other vacuum. at q 1 i he fiQMPIfiSSHIQSHPP y conduit n th t e uidmt swre-relie gn ui lnianother-embodiment-ofthe inyentionacontrol cyl+ inder containing a; pisto ye is I provided,- the-piston a v eing; held by re lientmeans n operating m tij n; a din siante i o; b rmq d y pressureiin the suction cquduit'gof a vacuumbox-which is. passed in-t e pa er a te pa sinsthe ra sfe r011; A fl d-p sure. supply conduit, a fluidpressure; relief'conduit, and a; control conduit for.- the actuators of flthe throttle 'valve in; the suction conduits of thewacuurn. oxes are conne t d thihe qontr lfiyl ns eemn tion-nfthe con ro conduit with the pressure fluid supplyjconduit, orwi th the relief conduit, or with neither: 0f; them being reflected depending on the position of the piston valve. The latter i s1preferably held qbetween two; springs, .the tension of at least oneof. the. springs being adjustable;

The- Y ?4 l I? which. re con ider d *charaeteri'stic the invention are: set-forth with particularity; in: the appended l Th invention itselfhowev'erandzaddi- .fidlifll ;ob1e cts and advantages thereofjwill best be understood front thefollowing; description of embodiments thereof when read in cqrijuriction' with the accompanying drawing, the one figure of whioh diagrammatically; i1- lu stra tes: a portion of a paper:making'machine-tofwhich the invention-isapplied.

d a e Wire 1 po which. hematp p 3 is formed travels overa coue'h roll l and aguideroll l m o P n sis. m y d rom he'F -u f i i r wire y ea s; o n fe Ia e 1 wh h; is 2 sho n in ner i s e l w n sitiant s d -ro1l r 4; a; suction h0g5; ar anged for this purpose.- The Pa ma r s, ans. e ed:.: r mthe Fourdrinier wirelto a ,felt ribbonlwhichegrtends around-the roller 4:and is guided by add-itiona-l rollers 6, 37,;and; 8;; The ribhon 9 eonducts the-paper mat onto aj second felt ,ribbondesigna ed y me l 6 an mat ns btw ea vi 1 mes: sure. ol s. 1 27. nd: '5- e ra 9 ta nsaust hn. ases 7 ns 8 anda h lt a 1.4 pmai a tionat s and. 2 :namsat ay called the wire screen portion, the part including the felt ribbons9 and 16 is called the felt portion the ribbon 16 and the press rollers 10 to 15 constituting the 'pness portion of the paper making machine, 4'

. -The suction box in the paper mat "transfer roller 4 1s connected at 23 with an intermediate inlet socket of a turboblower 22' by means of a suction conduit 21,21.

, part of the machineincluding the Fourdrinierwire 2 is The suction box 17 of the" roller is connected by means ofa suction conduit 47, 47', 27 at 28 with a suction socket of the blower 22. The suction boxes 18, 19, 20 of the rollers 10, 12, and 14, respectively, are connected by means of conduits 24, 25, 26, respectively, 'witha condu-it'Sl which terminates in the conduit 47.

e A conduit 30 is connected at 29 with the suction conduitportion27 and leads to the inside 31 of a bellows 32who se movable end 33 is connected by means of a rod 34 with a piston valve 36, 37 reciprocable in a cyl- 1 inder 35. A coil spring 40 is interposed between the a in which the spring 40'counterbalances th-epressure in the bellows 3'2 and the spring tension of the latter. The

reduced and consequently also the pressure in the conduit 30 and in the chamber 31. This causes a downward movement of the piston valve 36, 37 into normal operating or neutral position in which the point 50 is no more connected with the annular recess 44. roll 4-may now be lifted into an upperorinactive position without taking the paper along, When the valve 58 is in throttling position, the suction etfect of the suction box 5 is so little that the paper mat is not taken along by the transfer roll 4 if the latter. is lifted from the Fourdrinier wire'2. When the roll 4 is lifted, the normal,

flow of the paper is interrupted. The .papenmat 3 is not transferred to the felt ribbon 9 but remainson the Fourdrinierwi-re 2 until it reaches the roller 62; and drops into a container," not shown. The wet pulp is returned into the main reservoir, from which it is'again broughtonto the Fourdr-inier wire 2.

If after removal of the rests of paper in the felt POI? tion of the machine normal operation is to be resumed,

i. e. if the paper mat is to be transferred from the Fourdrinier wire 2 to the felt ribbon 9, the three-way valve .59 is moved by hand into the position in which the pressure I fluid control conduit 60 is connected with'thecontrol piston valve portion 36 controls an annular recess 43 through which'pressure oil may enter the cylinder 35 from a supply conduit 46. The valve portion 37 controls an annular recess 44 through which pressure oil may leave the cylinder '35 through a relief conduit 46.

The portion 48 of the cylinder 35 between the annular recesses 43 and 44 is connected at 50 with a control conduit system 49, 49", and 49", the conduits 49' and 49" being connected with fluid pressure responsive actuators 52 and 54, respectively, for operating throttle valve 53 and 55, respectively, in the suction conduits 51 and 47,

respectively. A control conduit 56, 56' connects the control cylinder 35 with a pressure fluid operated actuator 57 foroperating a throttle valve 58 in the suction conduit 21, 21 of the suction box 5 in the transfer roll 4.

A three-way valve 59. is interposed in the conduit 56, 56' by means of which the conduit 56' can be connected either-with the conduit 56 or by a conduit 60 with the annular recess 43 which is supplied with pressure fluid through the supply conduit 45 or by a conduit 61 with the annular recess 44 from which pressure fluid is relieved by the relief conduit 46. p V l The system according to the, invention operatesas folows:

At normal operation the individual parts are in the conduit 56' so that the actuator 57 receives pressure fluid from the supply conduit 45, and the valve 58 is opened;

against the action of the spring 65. The transfer roll 4 is now moved into the normal operating position which is the position shown in the drawing for picking up the paper mat 3,.whereupon the pressure in the suction box 5 'drops,'causing the paper mat to be lifted from the Fourdrinier wire 2 and to be transferred onto the'felt ribbon 9. Whenthe paper mat has covered the vacuum boxes 17 to 20, the pressure in the suction conduits 47, 24 to 26, and 51 is reduced; simultaneously, the pressure in the conduits 47', 27, and 30, and also in the chamber 31 is lowered, causing the pistons 36, 37 to temporarily move downward from the position shown in the drawing, so that the control conduits 49, 49', and 49" are connected with the pressure fluid supply conduit 45. The actuators 52 and 54 receive pressure fluid from the supply conduit 45' and open the throttle valves 53 and 55. Thereupon, the normal operation suction pressure is restored in the conduits'47, 47', 24.to 26,51; 27, and 30, and in position shown in the drawing. The three-way valve 59 is inthe position for automatically controllin-g the pressure in the suction box 5 in which positionthe control conduits '56 and 56' are interconnected. The paper covers all suction boxes 5 and 17ito 20, sothat aflow or suction pressure prevails in the respective suction conduits 21, 21; 47, 47';.24, 25, 26, 51, 27: There is a lso the same vacuum in the chamber 31 asin the conduit 27. The fluid pressure in the actuators 152,754, 57 is the same as in the space 48 of the'cylinder 35 so that the throttle valves 53, 55, 58 are held operi'again st the action of springs 63, 64, 65,respectively. f 3' I Ifthe paper is broken, for example at the press portion of the machine, ahead of the vacuum box 19, the pressure in the conduits 24, 25, 26,51, 47,47; 27-, and 30' and consequently also in the chamber 31 inside the thecharnber 31. Since the normal operation suction pressure is higher than the pressure previously prevailing in the chamber 31, the pistons 36, 37 is moved back to its normal operating position which is shown in the drawing. The three-way valve 59 can now be turned back: into the position for automatic control of the pressure in the suction box 5, i. e. into the position in which'the conduits 56 and 56' are interconnected. H The throttle valves 53, 55, and 58 are preferablyprovided with abutments 53', and 58', respectively, preventing complete closing of the valves, so that a minimum amount of air can pass through the throttle'valves, even when they are in throttling position, for preventing pumping of the compressor 22. a I During starting of the machine, the suction system according to the invention operates accordingly. 7

If the paper breaks after the felt portion of the machine, forexample at the dry end thereof, the three-Way valve 59 is moved into the position in which the pressure relief conduit 61 is connected with the control conduit 56. This causes closing of the valve 58 due to the action of the spring 65, the pressure fluid flowing out of the actuator 54 and through the relief conduit 46. Closing of the bellows 32 rises to almost atmospheric pressure.

tie valves 53, 515, 5'8 and the turbocompressornwill be valve SS'eflFectsan increase of the pressure in the suction box 5,.whereupon the normal flow of the paper mat is interrupted. The subsequent operation is the same as described supra.

The pressure in the suction box 5 can be so con trolled by the throttle valve 58 that the paper mat remains on the Fourdrinier wire 2 until it reaches the roller 62 immediately after movement of the valve 58 into throttling position and bcforethe transfer roll is lifted.

The j transfer away from the Pourdrinier wire 2. If it is desired to again transfer the paper mat from the Fourdrinier wire 2 to the felt ribbon 9, the three-way valve 59 must be turned into the position in which the conduit 60 is connected with the control conduit 56'. This causes opening of the valve 58, effecting a vacuum in the suction box 5 which vacuum pulls the paper mat from the Fourdrinier wire onto the felt ribbon 9. It is therefore not necessary that provisions be made affording lifting of the roll 4. The latter may be arranged to rotate on a stationary axis.

While specnic embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, additions and omissions may be made therein without departing from the spirit and scope of the invention as set forth in the appended claims.

What is claimed is:

l. A paper making machine comprising a wire at the wet end of the machine, a felt ribbon for taking over the paper mat from the wire, a roll over which said felt ribbon is laid, a suction box placed inside of said roll for normally drawing the paper mat from said wire to said felt ribbon, a plurality of rolls guiding the moving paper mat after it has been taken over by said felt ribbon, vacuum boxes individually connected with said last mentioned rolls for removing moisture from the paper mat, a turbocompressor, a conduit connecting said turbocompressor with said suction box and conduit means connecting said turbocompressor with said vacuum boxes for producing a vacuum in said boxes, a control mechanism responsive to the pressure in at least one of said vacuum boxes, a valve in the conduit connecting said turbocompressor with said suction box, and a manually operable device including means for selectively manually operating said valve and for connecting said control mechanism with said valve when said valve is not manually operated for automatic actuation of said valve by said control mecha nism according to the pressure in at least one of said vacuum boxes.

2. A paper making machine as defined in claim 1, including a pressure fluid operated actuator for said valve, said control mechanism including a pressure fluid supply conduit, a pressure fluid relief conduit, a control conduit connected with said actuator, a control valve adapted to be actuated by the pressure in at least one of said vacuum boxes and interposed between said control conduit and said pressure fluid supply and relief conduits for supplying pressure fluid into or relieving pressure fluid from said control conduit and for disconnecting the latter from said supply and relief conduits, valves in said conduit means, actuators for said last-mentioned valves, and conduit means connecting said last-mentioned actuators with said control conduit, said manually operable device being interposed in said control conduit between said first-mentioned actuator and the point where said last-mentioned conduit means is connected with said control conduit, said manually operable device being adapted to either afford free flow of pressure fluid through said control conduit or to connect said first-mentioned actuator for pressure fluid flow either with said pressure fluid supply conduit or with said pressure fluid relief conduit.

3. A paper making machine according to claim 2, in which said manually operable device is a three-way valve.

4. A paper making machine according to claim 2, in which said control valve includes a cylinder, said pressure fluid supply and relief conduits as well as said control conduit being individually connected for pressure fluid flow with said cylinder, a piston valve reciprocable in said cylinder for connecting either said pressure fluid supply conduit or said pressure fluid relief conduit with said control conduit or for disconnecting the latter from both said supply and relief conduits, means for moving said piston in response to the pressure in at least one of said vacuum boxes, and spring means tending to hold said piston valve in neutral position, in which it disconnects said control conduit from said supply and relief conduits, at normal operating conditions.

5. A paper making machine according to claim 4, in which said spring means include a spring at either end of said piston, and including means for manually adjusting the tension of at least one of said springs.

References Cited in the file of this patent UNITED STATES PATENTS 

